[PATCH] Longhaul - Need timer tick

[PATCH] Longhaul - Need timer tick

[Rafał Bilski]

There is no support for dynamic ticks in Longhaul. 
Current code is assuming that timer tick is present and 
constant.

Signed-off-by: Rafal Bilski <rafalbilski@interia.pl>
---
 arch/i386/kernel/cpu/cpufreq/Kconfig |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/i386/kernel/cpu/cpufreq/Kconfig b/arch/i386/kernel/cpu/cpufreq/Kconfig
--- a/arch/i386/kernel/cpu/cpufreq/Kconfig
+++ b/arch/i386/kernel/cpu/cpufreq/Kconfig
@@ -206,7 +206,7 @@ config X86_LONGRUN
 config X86_LONGHAUL
 	tristate "VIA Cyrix III Longhaul"
 	select CPU_FREQ_TABLE
-	depends on ACPI_PROCESSOR
+	depends on ACPI_PROCESSOR && !NO_HZ
 	help
 	  This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 	  VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T


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Re: [PATCH] Longhaul - Need timer tick

[Rafał Bilski]

> There is no support for dynamic ticks in Longhaul. 
> Current code is assuming that timer tick is present and 
> constant.
Please ignore this patch. Somehow NO_HZ option don't change 
anything. Average tick frequency is reduced to 20% for me 
(uptime / interrupt 0 count), but somehow when Longhaul 
is changing CPU frequency it is always equal to value set 
by "Timer frequency" option. Probably this is how NO_HZ 
author want it to work. Anyway, tested (with help of ACPI 
PM timer) and even if help for this option may sound scary 
for me, there is no change in transition latency. At least 
on my system.

Sorry
Rafa³


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